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Poster: Administrator, Curator, or Stafftracey pooh Date: Jan 13, 2006 1:12am
Forum: movies Subject: Re: why are thumbnails not created sometimes?

we can only create thumbnails for movies that have a "format" specifier (see the "Edit item" page) that we can understand.
And then, we can only make thumbs for movie files that our software can properly read (which is quite good software -- latest version of "mplayer" 8-)

here is our explicit list of formats that we can build thumbnails from:
MPEG2
MPEG1
Motion JPEG
256Kb MPEG4
256Kb QuickTime
64Kb MPEG4
MPEG4
64Kb QuickTime
56Kb QuickTime
QuickTime
Windows Media
IV50
(and we "prefer" formats in that order -- eg: if movie has both MPEG1 and MPEG2, we'll make thumbs from MPEG2).

--tracey, webmaster

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Poster: Administrator, Curator, or Staffindiworks Date: Jan 13, 2006 2:24am
Forum: movies Subject: Re: why are thumbnails not created sometimes?

i also posted this here (http://www.archive.org/iathreads/post-view.php?id=53954), just to make sure: i now created and uploaded thumbnails for my movie "vincent" (http://www.archive.org/details/Vincent_version_03_engl_subtitles_h264) myself since it did not work automatically, although the movie is an mpeg4 file - i also checked the "format" specifier on the edit item page...

i posted parts of the log, see the link above, maybe the build in mplayer can not handle an h.264 encoded mpeg-4 file...?

valentin (indiworks)

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Poster: Administrator, Curator, or Stafftracey pooh Date: Jan 13, 2006 7:14am
Forum: movies Subject: Re: why are thumbnails not created sometimes?

ok, so i'm *pretty* sure i've seen successful derives
of this kind of compressed movie (but not 100%)...


anyway, both "derive.php" tasks show the same error
in mplayer:
...
Building audio filter chain for 44100Hz/2ch/s16le -> 44100Hz/2ch/s16le...
Starting playback...
mplayer: h264.c:2306: mc_dir_part: Assertion `pic->data[0]' failed.

so it doesn't seem to understand the specific kind of
h264 encoding you have for this file.

you can add files (eg: your thumbnails) to your item
by doing the:
"Edit item"
"item manager"
"checkout .." button
and then FTP them in.
next hit the "Edit item" page again and describe the formats
See another movie on our site for how to name the files and thumbnail subdir, etc....

good luck!
--tracey

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Poster: Administrator, Curator, or Staffindiworks Date: Jan 13, 2006 7:58am
Forum: movies Subject: Re: why are thumbnails not created sometimes?

yes, thanks - i actually already managed to do that...

i was just mentioning this here, since i plan to upload all my future works as mpeg4/h.264 encoded files and the d.i.y. thumbnail creation can be a bit time consuming.

since you don't rule out that the deriver does not understand the h.264 encoding of my movie, here is what i did:

i exported from final cut (using the then latest quicktime 7.0.3) and encoded the .mp4 with an image size of 720 x 576, 25fps, 896 kbits/sec for picture - best quality/multi-pass - and 128 kbits/sec for sound using the aac codec. quicktime also said that "the file conforms to mp4 file format specification". so this looked o.k. to me, but obviously i can't rule out some strange or unknown quicktime related bug.

if there are any limitations to what the deriver can handle (kbits/sec etc.) then it would be good to know... (maybe interesting in that context: the actual file size of "vincent" is 332 mb, but the movie's site now says it's 348 mb.)

thanks,

valentin (indiworks)